// let arr=[]

// function dyx(){

//     console.log(arguments)
// }

// dyx(1,2,3,7,4,6,5)

function Dyx(name,sex,age){
    this.name=name
    this.sex=sex
    this.age=age
}

let dyx1=new Dyx('djh','女','18')
// console.log(dyx1);

// console.log(Dyx.prototype.__proto__.__proto__); //null
// console.log(dyx1.__proto__.__proto__.__proto__);//null

let a={}
Object.prototype.s=1

//  a.__proto__=Object

// console.log(Object.__proto__);
// console.log(a.is(1,2));
console.log(Object.prototype.s);

console.log(Math.floor(3.1))//向下取整